100W+ ERP and your head is right in the middle of the dipole.
Phones peak at about 5W, and they avoid transmitting at full power unless absolutely necessary to extend battery life.
Even if exposure risk was linear (it's not, it's way worse as you increase the instantaneous
I think it's this wall, in which case that's about as far back as they could put it. ~250m from the end of the actual runway.
There is no wall of death on the north side, but it has a gravel emergency stop and a big drainage pit past it.
Fun fact, while a drop in air pressure alone will cause some cooling in its container, the effect in "canned air" sprays is almost entirely due to evaporation of the liquid (usually fluorocarbons) inside.
Enthalpy of vaporization >>> Ideal gas law